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<meta name="description" content="An example of having the user customize a Palette by adding copies of Diagram nodes to the Palette&#39;s Model."/> 
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<title>Adding a Custom Node to a Palette</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
  <script src="../extensions/Figures.js"></script>
  <link rel='stylesheet' href='../extensions/DataInspector.css' />
  <script src="../extensions/DataInspector.js"></script>
    <script id="code">
    function init() {

      var $ = go.GraphObject.make;

      // initialize main Diagram
      myDiagram =
        $(go.Diagram, "myDiagramDiv",
          {
            "undoManager.isEnabled": true
          });

      myDiagram.nodeTemplate =
        $(go.Node, "Auto",
          { locationSpot: go.Spot.Center },
          new go.Binding("location", "location", go.Point.parse).makeTwoWay(go.Point.stringify),
          $(go.Shape, "Circle",
            {
              fill: "white", stroke: "gray", strokeWidth: 2,
              portId: "", fromLinkable: true, toLinkable: true,
              fromLinkableDuplicates: true, toLinkableDuplicates: true,
              fromLinkableSelfNode: true, toLinkableSelfNode: true
            },
            new go.Binding("stroke", "color"),
            new go.Binding("figure")),
          $(go.TextBlock,
            {
              margin: new go.Margin(5, 5, 3, 5), font: "10pt sans-serif",
              minSize: new go.Size(16, 16), maxSize: new go.Size(120, NaN),
              textAlign: "center", editable: true
            },
            new go.Binding("text").makeTwoWay())
        );

      // initialize Palette
      myPalette =
        $(go.Palette, "myPaletteDiv",
          {
            nodeTemplate: myDiagram.nodeTemplate,
            contentAlignment: go.Spot.Center,
            layout:
              $(go.GridLayout,
                { wrappingColumn: 1, cellSize: new go.Size(2, 2) }),
            "ModelChanged": function(e) {     // just for demonstration purposes,
              if (e.isTransactionFinished) {  // show the model data in the page's TextArea
                document.getElementById("mySavedPaletteModel").textContent = e.model.toJson();
              }
            }
          });

      // now add the initial contents of the Palette
      myPalette.model.nodeDataArray = [
        { text: "Circle", color: "blue", figure: "Circle" },
        { text: "Square", color: "purple", figure: "Square" },
        { text: "Ellipse", color: "orange", figure: "Ellipse" },
        { text: "Rectangle", color: "red", figure: "Rectangle" },
        { text: "Rounded\nRectangle", color: "green", figure: "RoundedRectangle" },
        { text: "Triangle", color: "purple", figure: "Triangle" },
      ];

      // initialize Overview
      myOverview =
        $(go.Overview, "myOverviewDiv",
          {
            observed: myDiagram,
            contentAlignment: go.Spot.Center
          });

      var inspector = new Inspector('myInspectorDiv', myDiagram,
        {
          // uncomment this line to only inspect the named properties below instead of all properties on each object:
          // includesOwnProperties: false,
          properties: {
            "text": {},
            // key would be automatically added for nodes, but we want to declare it read-only also:
            "key": { readOnly: true, show: Inspector.showIfPresent },
            // color would be automatically added for nodes, but we want to declare it a color also:
            "color": { type: 'color' },
            "figure": {}
          }
        });

      load();
    }

    // Show the diagram's model in JSON format
    function save() {
      document.getElementById("mySavedModel").value = myDiagram.model.toJson();
      myDiagram.isModified = false;
    }
    function load() {
      myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
    }

    function addToPalette() {
      var node = myDiagram.selection.filter(function(p) { return p instanceof go.Node; }).first();
      if (node !== null) {
        myPalette.startTransaction();
        var item = myPalette.model.copyNodeData(node.data);
        myPalette.model.addNodeData(item);
        myPalette.commitTransaction("added item to palette");
      }
    }

    // The user cannot delete selected nodes in the Palette with the Delete key or Control-X,
    // but they can if they do so programmatically.
    function removeFromPalette() {
      myPalette.commandHandler.deleteSelection();
    }
    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div style="width:100%; white-space:nowrap;">
    <span style="display: inline-block; vertical-align: top; padding: 2px; width:140px">
      <div id="myPaletteDiv" style="background-color: whitesmoke; border: solid 1px black; height: 400px"></div>
      <div id="myOverviewDiv" style="border: solid 1px black; height: 100px"></div>
    </span>
    <span style="display: inline-block; vertical-align: top; padding: 2px; width:500px">
      <div id="myDiagramDiv" style="border: solid 1px black; height: 500px"></div>
    </span>
    <span style="display: inline-block; vertical-align: top; padding: 2px; width:200px">
      <div id="myInspectorDiv" class="inspector"></div>
    </span>
  </div>
  <p>
    This sample supports the normal kind of drag-and-drop from a <a>Palette</a> to a <a>Diagram</a>.
    The Data <a>Inspector</a> allows you to edit the properties of a selected node in the diagram.
  </p>
  <p>
    This sample also supports dynamically adding a copy of a selected node in the diagram to the
    palette by the "Add To Palette" button.
    See the current state of the palette's model in the top textarea.
    The palette is <a>Diagram.isReadOnly</a>, so the user cannot delete selected nodes from the palette.
    But the "Delete From Palette" button removes any selected nodes from the palette.
  </p>
  <div>
    <button onclick="addToPalette()">Add To Palette</button>
    <button onclick="removeFromPalette()">Delete From Palette</button>
    Palette model:
  </div>
  <textarea id="mySavedPaletteModel" style="width:100%;height:200px"></textarea>
  <div>
    <button id="loadModel" onclick="load()">Load</button>
    <button id="saveModel" onclick="save()">Save</button>
    Diagram model:
  </div>
  <textarea id="mySavedModel" style="width:100%;height:200px">
{ "class": "go.GraphLinksModel",
  "nodeDataArray": [
    { "key": 1, "text": "hello", "figure":"Circle", "color":"green", "location":"0 0" },
    { "key": 2, "text": "world", "figure":"Rectangle", "color":"red", "location":"100 0" }
 ],
  "linkDataArray": [
    { "from":1, "to":2 }
 ]}
  </textarea>
</div>
    </div>
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